/* putimage example */ 



#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>



#define ARROW_SIZE 10



void draw_arrow(int x, int y);



int main()

{

    /* request autodetection */

    int gdriver = DETECT, gmode, errorcode;

    void *arrow;

    int x, y, maxx;

    unsigned int size;



    /* initialize graphics and local variables */

    initgraph(&gdriver, &gmode, "");



    errorcode = graphresult();

    if (errorcode != grOk)    /* an error occurred */

    {



	printf("Graphics error: %s\n", grapherrormsg(errorcode));

	printf("Press any key to halt:");

	getch();

	exit(1);               /* terminate with an error code */

    }



    maxx = getmaxx();

    x = 0;

    y = getmaxy() / 2;

    draw_arrow(x, y);



    /* calculate the size of the image and allocate space for it */

    size = imagesize(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE);

    arrow = malloc(size);



    /* grab the image */

    getimage(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE, arrow);





    /* repeat until a key is pressed */

    while (!kbhit()) {

	/* erase old image */

	putimage(x, y-ARROW_SIZE, arrow, XOR_PUT);

	x += ARROW_SIZE;

	if (x >= maxx)

	    x = 0;



	/* plot new image */

	putimage(x, y-ARROW_SIZE, arrow, XOR_PUT);

    }



    free(arrow);

    closegraph();

    return 0;

}

void draw_arrow(int x, int y) {

    moveto(x, y);

    linerel(4*ARROW_SIZE, 0);

    linerel(-2*ARROW_SIZE, -1*ARROW_SIZE);

    linerel(0, 2*ARROW_SIZE);



    linerel(2*ARROW_SIZE, -1*ARROW_SIZE);

}

